src/hotspot/cpu/aarch64/vm_version_aarch64.cpp

rev 54087 : 8251525: AARCH64: Faster Math.signum(fp)
Reviewed-by: aph, vlivanov, adinn

@@ -243,10 +243,16 @@
     if (FLAG_IS_DEFAULT(UseSIMDForMemoryOps)) {
       FLAG_SET_DEFAULT(UseSIMDForMemoryOps, true);
     }
   }
 
+  if (_cpu == CPU_ARM) {
+    if (FLAG_IS_DEFAULT(UseSignumIntrinsic)) {
+      FLAG_SET_DEFAULT(UseSignumIntrinsic, true);
+    }
+  }
+
   if (_cpu == CPU_ARM && (_model == 0xd07 || _model2 == 0xd07)) _features |= CPU_STXR_PREFETCH;
   // If an olde style /proc/cpuinfo (cpu_lines == 1) then if _model is an A57 (0xd07)
   // we assume the worst and assume we could be on a big little system and have
   // undisclosed A53 cores which we could be swapped to at any stage
   if (_cpu == CPU_ARM && cpu_lines == 1 && _model == 0xd07) _features |= CPU_A53MAC;